Ever: Fawlty towers, Red dwarf, Blackadder

Nowadays: Modern family, Just 4 laughs, Big bang theory, The middle, Celebrity apprentice

Had a similar thing happen to me.  I saw one or two episodes and was like wtf is this?  Then I ended up watching a couple more episodes at a friends and was hooked.  I initially disliked Charlie because he's so dumb, but after getting used to him I really appreciate the comedy.

Tosh.0 - is great for catching up on the funniest videos on youtube , i like to watch that show just to find some crazy videos to show off to friends

Red Eye- its a late night fox political news kind of show, has some edgy humor , which I can get into

The Burn with Jeff Ross- funny comedy show where Jeff Ross and some pals trashmouth the audience and each other.

Frasier

Anyone says anything different, they are wrong. Watched it like every night when I got the boxset on DVD.

The news?

Community

it one hell of a cleaver show,

In no particular order :
Arrested Development : As someone already mentioned, the comedy is very, very rich, and i find myself still "getting" jokes on my 4th, 5th watch-throughs.

Seinfeld: the main reason I like the show better than its contemporaries(all great shows lke Frasier, Friends,
Raymond) is because of the dry wit, and the fact that non of the lead characters are even remotely likeable.

Blackadder : must mention that I hated the first season, and am very fortunate to have persisted with the series. Contradictory to the general sentiment, I felt this was better than Fawlty Towers, and Atkinson, in turn, better than Cleese.

Yes Minister/Prime Minister : My favorite political satire(probably because the British political structure is very much close to what we have in India). Best Dialogue writing in all of television, for me.

honorable mentions would be Frasier, Modern Family, Happy Days(i guess it started off as a sitcom) and Diff'rent Strokes

Al Bundy

To the OP : I really used to enjoy Its always Sunny in Philadelphia , but for some reason they kept makin Charlie dumber and weirder to the point of turning him border-line retarded. Its clear he is the central character of the cast,and Cgharlie Day the best actor of the lot so i guess it irked me how the writers were just Homer-ising him. Stopeed watching at season 5, i think

I'm assuming you mean sit-com, and that would most definitely be Scrubs. If you mean any kind of comedy show, it would be Whose Line Is It Anyway.